Exam 3: The Plasma Membrane and Membrane Potential

Which of the following is least related to glucose uptake by different cells in the body?

Glucose may pass through a plasma membrane using all of the following methods EXCEPT

Leak channels for sodium are closed during the resting potential but open with appropriate stimulation.

Use the figure above to answer the corresponding questions. -Which protein could be associated with active movement of a substance through the membrane? a.1 b.2 c.3 d.4 e.5

Which statement(s) is/are true about membrane potentials?

Indicate the various roles of the following ions using the answer in the column below. a.Na+ b.K+ c.A- d.Cl- -Anion to which the membrane is impermeable

Which statement is most likely to be true about a crenating cell?

During the resting potential

At equilibrium, when no net diffusion of Na⁺ or K⁺ is occurring through the membrane, Na⁺-K⁺ pumps do not have to pump Na⁺ or K⁺.

Opening a potassium channel during the resting membrane potential would cause the inside border of the plasma membrane to become more negative.

"Kiss" sites are associated with cell-to-cell connections called ____________________.

Which intercellular connections force transcellular transport to occur.

Large protein anions do not leave the cell because there is no concentration or electrical gradient to drive it outward.

Most of a membrane potential is established by the passive movement of different cations into and out of a cell.

The SGLT and GLUT carriers both move a substance down a concentration gradient.

Match the term to the correct description. a.collagen b.elastin c.fibronectin d.keratin -Provides receptor sites for binding molecules in the ECF that modify cell function

Which statement would be true at a membrane during its resting membrane potential?

Unassisted membrane transport can sometimes require the cell to expend energy.

Tight junctions

Molecules greater than 0.8 nm in diameter are too large to pass from the ECF into the cytosol through channels.